Since the Hejaz railway from Damascus to Medina also had steep gradients and tight curves, a powerful locomotive was needed for freight trains. Since the tracks were also light with a gauge of just 1,050 mm, six axles were needed to achieve the necessary power. Since there was a lack of water along the route, the tender had to be big enough. The order went to Henschel in Kassel, where four Mallets were built to meet these requirements.

sectional drawing

flickr/Historical Railway Images

The six axles were distributed over two chassis groups, the first of which had only two coupled axles and one leading axle. The first coupled axle could also be moved laterally to improve running characteristics in curves. The two chassis groups were coupled to each other, which is not usual with Mallets. The locomotives apparently met the requirements and easily hauled 250-tonne trains over the entire route.